/*
 moo.fx, simple effects library built with prototype.js (http://prototype.conio.net).
 by Valerio Proietti (http://mad4milk.net) MIT-style LICENSE.
 for more info (http://moofx.mad4milk.net).
 10/24/2005
 v(1.0.2)
 */

//base
var fx = new Object();
fx.Base = function() {
};
fx.Base.prototype = {
    setOptions: function(options) {
        this.options = {
            duration: 500,
            onComplete: ''
        }
        Object.extend(this.options, options || {});
    },
    go: function() {
        this.duration = this.options.duration;
        this.startTime = (new Date).getTime();
        this.timer = setInterval(this.step.bind(this), 13);
    },
    step: function() {
        var time = (new Date).getTime();
        var Tpos = (time - this.startTime) / (this.duration);
        if (time >= this.duration + this.startTime) {
            this.now = this.to;
            clearInterval(this.timer);
            this.timer = null;
            if (this.options.onComplete)
                setTimeout(this.options.onComplete.bind(this), 10);
        }
        else {
            this.now = ((-Math.cos(Tpos * Math.PI) / 2) + 0.5) * (this.to - this.from) + this.from;
            //this time-position, sinoidal transition thing is from script.aculo.us
        }
        this.increase();
    },
    custom: function(from, to) {
        if (this.timer != null)
            return;
        this.from = from;
        this.to = to;
        this.go();
    },
    hide: function() {
        this.now = 0;
        this.increase();
    },
    clearTimer: function() {
        clearInterval(this.timer);
        this.timer = null;
    }
}

//stretchers
fx.Layout = Class.create();
fx.Layout.prototype = Object.extend(new fx.Base(), {
    initialize: function(el, options) {
        this.el = $(el);
        this.el.style.overflow = "hidden";
        this.el.iniWidth = this.el.offsetWidth;
        this.el.iniHeight = this.el.offsetHeight;
        this.setOptions(options);
    }
});

fx.Height = Class.create();
Object.extend(Object.extend(fx.Height.prototype, fx.Layout.prototype), {
    increase: function() {
        this.el.style.height = this.now + "px";
    },
    toggle: function() {
        if (this.el.offsetHeight > 0)
            this.custom(this.el.offsetHeight, 0);
        else
            this.custom(0, this.el.scrollHeight);
    }
});
